Question

1. What are the essential and desirable requirements of materials for eyeglass?

2. What are the essential and desirable requirements of materials for a disposable water bottle that does minimal environmental harm?

Answer 1

1.

Fundamentals: The optical characteristics are vital, so a material with an optical quality straightforwardness is the main necessity. It is likewise basic that it can be shaped or ground to the accuracy with required remedy. What's more, must oppose sweat and be adequately scratch impervious to adapt to typical dealing with.

Necessities Desirable: A high refractive list and low thickness permit more slender and in this way lighter focal points, A material with modest cost permits customer less sum or producer more edge of benefit.

2.

Fundamentals: The wellbeing viewpoint starts things out, The material of jug must be non-poisonous and ready to handled in a way that leaves no contaminants. the jug will meet its expected utilize just if its material and process used to shape it are shoddy.

Alluring Requirements: The material of the container ought to be recyclable and if conceivable biodegradable. it makes taking care of simpler if the material isn't weak, despite the fact that glass bottles are generally utilized.